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RFC 1700 - x25-type-numbers

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    X.25 TYPE NUMBERS

    CCITT defines the high order two bits of the first octet of call user
    data as follows:

    00 - Used for other CCITT recomendations (such as X.29)
    01 - Reserved for use by "national" administrative
         authorities
    10 - Reserved for use by international administrative authoorities
    11 - Reserved for arbitrary use between consenting DTEs

    Call User Data (hex)     Protocol                      Reference
    -------------------      --------                      ---------

    01                       PAD                               [GS2]
    C5                       Blacker front-end descr dev       [AGM]
    CC                       IP                         [RFC877,AGM]*
    CD                       ISO-IP                            [AGM]
    CF                       PPP                           [RFC1598]
    DD                       Network Monitoring                [AGM]

    *NOTE: ISO SC6/WG2 approved assignment in ISO 9577 (January 1990).

    REFERENCES

    [RFC877] Korb, J., "A Standard for the Transmission of IP Datagrams
             Over Public Data Networks", RFC 877, Purdue University,
             September 1983.

    [RFC1598] Simpson, W., "PPPin X.25", RFC 1598, Daydreamer, March 1994.

    PEOPLE

    [AGM]     Andy Malis

    [GS2]     Greg Satz

    []

Connected: An Internet Encyclopedia
RFC 1700 - x25-type-numbers